View Compilation Error

0_0_5350816_32613.cpp: In function `int main()':
0_0_5350816_32613.cpp:4: error: expected unqualified-id before "long"
0_0_5350816_32613.cpp:4: error: expected `,' or `;' before "long"
0_0_5350816_32613.cpp:8: error: `sum' undeclared (first use this function)
0_0_5350816_32613.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)